"IIRC, hypo-sprays predate Star Trek ...
However, the magical too used ST:TNG (I'm not sure about TOS) to close up wounds without sutures has only been pioneered recently.
Google "laser tissue welding" with or without "albumin". "
(Yossi Preminger 5/7/2008 8:23:45 PM)

"The reason that they used hyposprays on the original star trek is because the censors wouldn't allow them to use needles on national television."
(Robert 5/8/2008 6:06:18 AM)

"Did it say lidocaine? As in "Never mess with a Sycilian when death is on the line!""
(muj0 5/8/2008 8:16:42 AM)